[Android(安卓)UI界面] 怎样实现ListView分页效果？

import android.app.ListActivity;
import android.os.Bundle;
import android.util.Log;
import android.view.Gravity;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AbsListView;
import android.widget.BaseAdapter;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.AbsListView.OnScrollListener;
import android.widget.LinearLayout.LayoutParams;
/**
*
* @author huangbq
*
*/
public class MainActivity extends ListActivity implements OnScrollListener {

private static final String TAG = "MainActivity";
private listViewAdapter adapter = new listViewAdapter();
ListView listView ;
private int lastItem = 0;
LinearLayout loadingLayout;
/**
* 设置布局显示属性
*/
private LayoutParams mLayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT,LinearLayout.LayoutParams.WRAP_CONTENT);
/**
* 设置布局显示目标最大化属性
*/
private LayoutParams FFlayoutParams =new LinearLayout.LayoutParams(LinearLayout.LayoutParams.FILL_PARENT,LinearLayout.LayoutParams.FILL_PARENT);

private ProgressBar progressBar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
Log.i(TAG, "onCreate(Bundle savedInstanceState)>>>>>>>>>>>>>>>" );
//线性布局
LinearLayout layout = new LinearLayout(this);
//设置布局水平方向
layout.setOrientation(LinearLayout.HORIZONTAL);
//进度条
progressBar = new ProgressBar(this);
//进度条显示位置
progressBar.setPadding(0, 0, 15, 0);
//把进度条加入到layout中
layout.addView(progressBar, mLayoutParams);
//文本内容
TextView textView = new TextView(this);
textView.setText("加载中...");
textView.setGravity(Gravity.CENTER_VERTICAL);
//把文本加入到layout中
layout.addView(textView, FFlayoutParams);
//设置layout的重力方向，即对齐方式是
layout.setGravity(Gravity.CENTER);

//设置ListView的页脚layout
loadingLayout = new LinearLayout(this);
loadingLayout.addView(layout, mLayoutParams);
loadingLayout.setGravity(Gravity.CENTER);

//得到一个ListView用来显示条目
listView = getListView();
//添加到页脚显示
listView.addFooterView(loadingLayout);
//给ListView添加适配器
setListAdapter(adapter);
//给ListView注册滚动监听
listView.setOnScrollListener(this);
}
@Override
public void onScroll(AbsListView v, int firstVisibleItem,
int visibleItemCount, int totalItemCount) {
Log.i(TAG , "Scroll>>>first: " + firstVisibleItem + ", visible: " + visibleItemCount + ", total: " + totalItemCount);
lastItem = firstVisibleItem + visibleItemCount - 1;
Log.i(TAG , "Scroll>>>lastItem:" + lastItem);
//显示50条ListItem，即0-49，因为onScroll是在“滑动”执行过之后才触发，所以用adapter.count<=41作条件
if (adapter.count<=41) {
if (firstVisibleItem+visibleItemCount==totalItemCount) {
adapter.count += 10;
adapter.notifyDataSetChanged();
listView.setSelection(lastItem);
int currentPage=adapter.count/10;
Toast.makeText(getApplicationContext(), "第"+currentPage+"页", Toast.LENGTH_LONG).show();
}
}
else {
listView.removeFooterView(loadingLayout);
}

}
@Override
public void onScrollStateChanged(AbsListView v, int state) {
if (lastItem == adapter.count && state == OnScrollListener.SCROLL_STATE_IDLE) {
Log.i(TAG,"ScrollStateChanged>>>state:"+state+"lastItem:" + lastItem);
//显示50条ListItem，即0-49，因为onScrollStateChanged是在“拖动滑动”执行过之后才触发，所以用adapter.count<=41作条件
if (adapter.count<=41) {
adapter.count += 10;
adapter.notifyDataSetChanged();
}

}
}
/**
* 要用用于生成显示数据
* @author huangbq
*
*/
class listViewAdapter extends BaseAdapter {
int count = 10;
public int getCount() {
Log.i(TAG, "getCount>>>count:" + count);
return count;
}
public Object getItem(int pos) {
Log.i(TAG, "getItem>>>pos:" + pos);
return pos;
}
public long getItemId(int pos) {
Log.i(TAG, "getItemId>>>ItemId:" + pos);
return pos;
}
public View getView(int pos, View v, ViewGroup p) {
Log.i(TAG, "getView>>>pos:" + pos);
TextView view;
if (v==null) {
view = new TextView(MainActivity.this);
}
else {
view=(TextView)v;
}
view.setText("ListItem " + pos);
view.setTextSize(20f);
view.setGravity(Gravity.CENTER);
view.setHeight(60);
return view;
}
}
}

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